A long time ago, the Mongols invented stirrups, which turned out to be really useful in their invasion of most of the known world. At the tip of the Korean peninsula, however, they were stymied by water, but they persevered, built boats, and invaded Japan twice, not having learned from their first failed attempt (a typhoon disrupted their second, larger attempt, leading to the term “kamikaze”). Between the two invasions, walls were built along the Fukuoka coast, some of which still exist, and Higo (as Kumamoto was then known) forces were also involved.
It was kind of a big thing at the time, and an artist, Takesaki Suenaga (竹崎季長) was commissioned by the powers that be - who were, at that time, in Kikuchi - to depict it, so he came up with two scrolls around 1280 (dates vary). known as 「蒙古［もうこ］襲来絵［え］詞［ことば］」- “Images of the Mongol Invasion.” They are seldom displayed, but Kumanichi reports that for the first time in 17 years, both, one measuring 24 meters and the other 21 meters in length, are on display until mid-December at the Museum of Science (in the prefectural library). One sample of a scroll is shown below; links are to the Kumanichi article and the Wikipedia page regarding the scrolls. Admission is free. - William
https://this.kiji.is/430864124722300001?c=92619697908483575
https://ja.wikipedia.org/wiki/%E7%AB%B9%E5%B4%8E%E5%AD%A3%E9%95%B7
Note: Apologies for the misdirection regarding the location of the museum - it’s located within the prefectural library near Ezuko: https://www2.library.pref.kumamoto.jp/?page_id=476